> Also it seems pwm-backlight hardware is unusable at the moment. I'm not 
> sure whether the pwm-backlight or sun4i-pwm driver is to blame. I had to 
> manually poke the pwm registers so the LCD backlight wouldn't be 
> completely black. 

Have same problem with Marsboard A20 and simple-panel setup.
After some investigation i found panel is always `disabled`.
This affects backlight and pwm drivers behavior.
Panel enablement is the responsibility of tcon driver.
ChenYu, please investigate some more.

BR
Siarhei

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